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One‐Pot Preparation of Methyl N ‐Phenyl Carbamate and Zn(OAc) 2 /SiO 2 Catalyst with Enhanced Stability
Author(s) -
Li Fang,
Li Song,
Jia Aizhong,
Gao Liya,
Xue Wei,
Zhang Yanhua,
Wang Yanji
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201902219
Subject(s) - aniline , catalysis , selectivity , chemistry , dimethyl carbonate , carbamate , nuclear chemistry , zinc , medicinal chemistry , organic chemistry
The one‐pot preparation of methyl N ‐phenyl carbamate (MPC) and supported Zn(OAc) 2 /SiO 2 ‐OP was investigated. Zn(OAc) 2 and SiO 2 were added to the reaction between dimethyl carbonate (DMC) and aniline upon which MPC and Zn(OAc) 2 /SiO 2 ‐OP were obtained simultaneously. The co‐prepared Zn(OAc) 2 /SiO 2 ‐OP showed superior catalytic performance for MPC synthesis, giving a aniline conversion of 96.3% and a MPC selectivity of 99.7%. Compared with catalyst prepared by incipient impregnation, Zn(OAc) 2 /SiO 2 ‐OP was more stable during the reaction, and the aniline conversion was 85.0% with MPC selectivity of 88.2% for the seventh time. The catalyst was characterized and the results suggested that Zn(OAc) 2 , Zn 5 (OH) 8 (OAc) 2 ⋅2H 2 O, ZnO and Zn 4 O(OAc) 6 are present on SiO 2 surface. Zn(OAc) 2 and Zn 4 O(OAc) 6 are the active sites for MPC synthesis. The superior stability of the Zn(OAc) 2 /SiO 2 ‐OP catalyst came from the presence of Zn 4 O(OAc) 6 .